Re: [equinox-dev] Service Lookup by GUID very Slow

[Thomas Watson <tjwatson@xxxxxxxxxx>]

I was also not sure what you meant by GUID.  After some thought I think you probably mean the service id or perhaps the service pid (service.id and service.pid properties)?

And by lookup I assume you are using some kind of service filter, for example "(service.id=23)" with a call to BundleContext.getServiceReferences.  I will say that the service registry is not optimized for this kind of lookup.  You are far better keeping your own data structure that optimizes the lookup over the set of service references and indexes on the keys that you want to use to lookup service references.  This can easily be done with a ServiceTrackerCustomizer.

Tom



BJ Hargrave---05/03/2012 10:04:05 PM---What is service lookup by GUID? Services don't have globally unique identifiers. Can you provide more information on the specif

From:	BJ Hargrave/Austin/IBM@IBMUS
To:	Equinox development mailing list <equinox-dev@xxxxxxxxxxx>,
Date:	05/03/2012 10:04 PM
Subject:	Re: [equinox-dev] Service Lookup by GUID very Slow

---

What is service lookup by GUID? Services don't have globally unique identifiers. Can you provide more information on the specifics of your lookup? Such as the code snippet? 

--

BJ Hargrave Senior Technical Staff Member, IBM OSGi Fellow and CTO of the OSGi Alliance hargrave@xxxxxxxxxx

office: +1 386 848 1781 mobile: +1 386 848 3788

From:        <Stanley_Poon@xxxxxxxx> 
To:        <equinox-dev@xxxxxxxxxxx>, 
Date:        2012/05/03 16:54 
Subject:        [equinox-dev] Service Lookup by GUID very Slow 
Sent by:        equinox-dev-bounces@xxxxxxxxxxx

---

In an experiment to have 200K of services registered, the service lookup by GUID is exceedingly slow – more the 4 seconds per lookup. 
  
There are enough RAM (8G) and heap (2G) allocated. 
  
What would be the reason of the slowness of the lookup? Any settings to start the framework to improve this? 
  
  
Thanks, 
Stanley_______________________________________________
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